Light Emitting Device Electrode Terminals for Stable Connection

Solution Overview

Problem

Existing light emitting devices face challenges in stable and reliable external connection due to their thin electrode layers, making it difficult to connect them securely and efficiently.

Innovation Solution

A light emitting device design featuring a light emitting element with electrode posts covered by a covering member, paired electrode layers on the covering member, and thicker electrode terminals that are electrically connected to the layers and spaced wider than the posts, allowing for stable external connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a thin electrode layer is used to maintain small device size, then the device size is reduced, but the ease of external connection deteriorates

Engineering Contradiction:

Improvedevice sizeVSAvoidexternal connection

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The electrode structure is segmented into three distinct parts: a thin electrode layer for maintaining small size, thicker electrode terminals for reliable connection, and intermediate connection portions linking them. This segmentation allows each part to fulfill its specific function optimally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode terminals extend in the thickness direction (vertical dimension) rather than only in the planar direction. This dimensional change allows the terminals to protrude from the covering member surface, providing accessible connection points without increasing the device's footprint area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If a thin electrode layer is used, then the device size is reduced, but the reliability of connection deteriorates

Engineering Contradiction:

Improvedevice sizeVSAvoidconnection stability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The electrode structure is segmented into three distinct parts: a thin electrode layer for maintaining small size, thicker electrode terminals for reliable connection, and intermediate connection portions linking them. This segmentation allows each part to fulfill its specific function optimally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thicker electrode terminals are designed in advance to compensate for the fragility of thin electrode layers. The terminals serve as a cushioning element that ensures reliable connection even though the main electrode layer remains thin, preventing connection failures before they occur.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Volume of moving object

If electrode terminals are placed close together to maintain compact design, then device size is reduced, but the difficulty of external connection increases

Engineering Contradiction:

Improvedevice sizeVSAvoidexternal connection

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The electrode terminals extend in the thickness direction (vertical dimension) rather than only in the planar direction. This dimensional change allows the terminals to protrude from the covering member surface, providing accessible connection points without increasing the device's footprint area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11264552B2Light emitting device, light emitting module, method of manufacturing light emitting device, and method of manufacturing light emitting module

Publication Date: 2022.03.01 NICHIA CORP

AI summary

The light emitting device includes: a light emitting element, a covering member, a pair of electrode layers, and a pair of electrode terminals. The light emitting element has an electrode-formed surface on which a pair of electrode posts are formed. The covering member covers an electrode-formed surface of the light emitting element while forming an exposed portion of each of the pair of electrode posts which is exposed from the covering member. The pair of electrode layers are provided on a surface of the covering member and electrically connected to the exposed portions of the pair of electrode posts. The pair of electrode terminals are electrically connected to the pair of electrode layers, and provided on the surface of the covering member. The pair of electrode terminals are thicker than the pair of electrode layers, and are disposed at an interval larger than an interval between the pair of electrode posts.